Heat-becruxatob fob dough-raisers



AXUGUST'KNUTSON, OF MAPIJETON, MINNESOTA.

HEAT-REGULATOR FOR DOTIGH-RAISERS.

nausea.

Application filed February 8, 1919. Serial No. 275,750.

To all whom it may concern Be itknown that I, AfUGUST KNU'rsoN, a

a citizen of the United States, residing at Mapleton, in the county of Blue Earth, State of Minnesota, have invented certain new and useful Improvements in Heat- Regulators for Dough-Raisers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and usethe same'.

This invention relates to new and useful improvements in dough raisers and particularly to heating devices therefor.

One object of the present invention is to provide a novel and improved means for regulating the flame of the heating lamp whereby the temperature within'the device will be maintained at a constant degree.

Another object is to provide a device of this character which includes a novel and improved cover so constructed that the heat will be retained Within the casing but at the same time permit inspection of the interior without the necessity of raising the lid or cover.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

In the drawing:

Figure 1 is a side elevation of the device.

Fig. 2 is a vertical sectional View taken on the line 2-2 of Fig. 1.

Fig. 3 is a horizontal sectional view taken on the line 3-3 of Fig. 1.

Fig. 4 is an enlarged elevation of a portion of the burner and the regulator.

Fig. 5 is an enlarged vertical sectional view taken on the line 55 of Fig. 4.

Referring particularly to the accompanying drawing, 10 represents a box which is supported on the legs 11, sand box having the upper face of its bottom covered with a sheet of asbestos or other suitable fireproof material 12. Secured within the box, and in spaced relation above the bottom, is a double walled floor 13, the lower face of the lower portion of which is also covered with an asbestos sheet 14. The four sides of the box, between the floor 13 and the bottom of the box are covered with asbestos sheeting 15.

Extending transversely through the box, below the floor 13, is a hot air pipe 16, one

Specification of Letters Patent.

PatentedJuly 29, 1919.

end terminating at one side of the box and being open to the atmosphere, while the other end is turned downwardly, as shown at 17 where it is connected to the upperend of a frusto-conioal. metallic chimney 18. In one side of this chimney there is disposed a transparent window 19 to permit a view of the flame of the burner of the lamp 20. This lamp is disposed on .a shelf 21carried by a bracket 22 which is secured, detachablyto two of the legs 11 of the box.

The cover of the box, which is hinged thereto at 23, comprises a frame 24 to the upper side of which is secured a pair of glass panes 25. In the lower edge of the frame, where said frame contacts with the upper edge of the box, there is secured a ks)trip of felt to retain the heat within the In the sides of the frame 24 there are formed the ventilating openings 26, said openings being covered by the pivoted closure plates 27.

Similarly formed in the sides of the box, between the bottom and the double floor, are the ventilating openings 28, controlled by the pivoted closure plates 29.

Mounted within the box, between the bottom and the floor 13, is a thermostat 30, and connected to this thermostat, and extending through the side of the box, adjacent to the lamp, is a link or rod 31. This link is pivotally connected to the crank end 32 of shaft 33 which extends through the lamp burner 34. On the portion of the shaft which is disposed transversely of the wick tube 35 of the burner there is formed a crank member 36 which supports an upwardly tapering member 37 which is disposed in embracing relation to the wick tube and arranged to slide vertically thereon. Within this member 37 is secured a second member which slidably embraces the wick tube, and is shown at 38. One side of the lower edge of the member 37 rests on the crank member 36 and is arranged to move upwardly under the influence of said crank.

When the thermostat expands, under the influence of the heat in the box, the shaft will be rocked with the result that the crank member 36 will rise and lift the member 37 upwardly, so that the flame from the wick will be reduced in size and intensity, thus producing a reduction of temperature in the box. With this construction the temperature will be automatically regulated and a constant degree maintained, with the result that the dough will be properly raised and danger of too great and consequent souring of the dough prevented. The device may also be used with efiectiveness, for the purpose of testing seed corn, or for a bread or cake box.

What is claimed is: V v a 1. The combination with the wick tube of a lam burner, of a vertically slidable member disposedin embracing relation to the wick tube, an open ended irusto-prismatic member spaced outwardly from the slidable member and secured to and movable there with, "and a crank shaft carried by the burner and engaging in supporting relation beneath the frusto-prismatic member for raising and lowering the same.

2. The combination with a lamp burner Qlopies of this patent may be obtained for having a wick tube, of a casing fitted around the tube and slidable vertically thereon to lie partly above the upper end of the tube AUGUST KNUTSON.

Witnesses r H. C. PICKEL, P. R. HAMMER.

five cents each, by addressing the Commissioner of Patents.

Washington, D. 0. 

